Concrete-mixing machine.



' No. 702,881. Patented lune l7, I902. 0. ans. CONCRETE IIXING MACHINE.

(Application Mod Km. 18, 1901.)

(No Model.)

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UNITED STATES PATENT OFFICE.

CARL OTIS, OF LINDSTROM, MINNESOTA.

CONCRETB-MIXlNG MACHINE.

SPECIFICATION forming part of Letters Patent No. 702,881, dated June 17,1902.

Application filed March 18, 1901. Serial No. 51,592. (No model.)

To CLZZ whom it may concern.

Be it known that I, CARL OTIS, a citizen of the United States, residingat Lindstrom, in the county of Chisago and State of Minnesota, haveinvented new and useful Improvements in Concrete-Mixing Machines, ofwhich the following is a specification.

My invention relates to improvements in concrete-mixing machines. Itsobject is to produce a simple machine that will quickly and efiicientlymix cement, water, sand, and gravel or other materials for formingconcrete. custom to perform this work by hand. With my machine this isaccomplished automatioally and in amore efficient manner.

In the accompanying drawings, forming part of this specification, Figure1 is a plan View of my improved concrete-mixing ma chine. Fig. 2 is alongitudinal sectional view of Fig. 1. Fig. 3 is a detail sectional viewof one of the doors in the receiving-receptacle of my improvedconcrete-mixing machine.

In the drawings let A represent the mixingreceptacle, which ispreferably provided with the circular wall The vertical shaft 3 isjournaled centrally in the mixing-receptacle by the journal-bearings 4and 5. This shaft is driven by the beveled gear 6 and pinion 7. Thepinion 7 is carried by the counter-shaft S, which is journaled'in thebracket 9 and the bearing 10. The bracket 9 is fastened to the frame ofthe mixing-receptacle by bolt 11, and the journals l and 10 are carriedby the supporting-arm 12, which is fastened to the frame of themixing-receptacle by bolts 13. The counter-shaft Sis driven by thedrivepulley 14 or by any other suitable means. The conical shell 15 isfastened to the base of the mixing-receptacle by bolts 16 and is usedfor the purpose of protecting the vertical shaft from the concrete whenthe machine is in operation. The vertical shaft passes through theconical shelh The journal 5 is carried by the supporting-arm 17, whichis fastened to the circular wall of the receptacle by bolts 18.

In operation the measuring-buckets B and C are respectively adapted toreceive and measure the cement and sand and the gravel which are to bemixed in the receptacle A. The bucket 13 is journaled in the frame 19,

sand.

Heretofore it has been the general which is bolted at 20 to the circularwall of the mixing-receptacle, and the measuringbucket C is journaled inthe frame 21, which is also bolted to the wall 2 by bolts 22. Themeasuring-buckets vary in size according to the amounts of cement, sand,and gravel used in the concrete. As shown in Fig. 1, the bucket B isprovided with the dividing-wall 23. The portion 2d of this bucket isadapted to receive the cement and the portion the The bucket 0 receivesthe gravel. Then the buckets are filled, they are turned by hand ontheirjournals 26 to the position indicated by the broken lines in Fig. 2and their contents emptied in to the mixing-receptacle. lVheu emptied,they are returned to their normal position, as shown by the full linesin Fig. 2, where they are retained by the locks 27, which are adapted toimpinge against the shoulders 28, respectively, of the frames 19 and 21.The water-tank D is fastened to the circular wall of themixing-receptacle by the frame29. This tank is provided with the faucet30 and is adapted to hold the requisite amount of water to be used forthe concrete.

The verticalv shaft 3 carries the mixingblades E and F by thesupporting-arm 31, which is fastened to the blades by the rivets 32 andto the vertical shaft by the collar and bolt 46 and 47. These blades arepositioned in the receiving-receptacle and are adapted to revolve withthe shaft in the direction of the'arrow shown in Fig. 1., The blade Ffaces toward the outer wall of the receptacle and the blade E toward theconical shell 15. The relative positions and shapes of the blades aresuch that the cement, water, sand, and gravel are turned back and forthand thoroughly mixed when the machine is in operation.

\Vhile I have shown two mixing-blades, it is obvious that any number maybe used to accomplish the desired results without departing from theprinciples which I have applied.

The floor 33 of the mixing-receptacle is provided with the doors 3i and35, which are hinged at 36. These doors are opened and closed by thelever-arms 37, which are pivoted at 38 to the floor and connected at 39to the floors by the cables 40. These cables pass over thepulley-sheaves 41, which are carried by the base of thereceiving-receptacle, and over the pulleys 42, which are carried by thearms 43 (shown in Fig. 3) on the doors.- As shown in Fig. 1, the doorsare in closed position and locked by the catches 44 on the frame of thereceptacle. These catches engage the free ends of the levers 37. Byreleasing the catches the levers swing outwardly and the doorsopen. Whenopen,therevolving-blades E and F empty the concrete through the opendoorways 45. When the receiving-receptacle is empty and the doorsclosed, the receivingreceptacle is in readiness for another charge ofsand, cement, gravel, water, 850., from the buckets and the water-tank.

Having described my invention, what I claim as new, and desire toprotect by Letters Patent, is-

1. A machine of the class set forth consisting-in combination with amixing-receptacle having outer and inner walls, a pair of mixing-bladesfacing said outer and inner walls, so as to turn the contents of thereceptacle back and forth at each revolution, a vertical shaft passingcentrally through said receptacle by which said blades are revolved,means for driving the shaft so as to revolve the blades between saidwalls, and a system of outlets in the base of said receptacle, adaptedto empty the same.

2. Aconci'ete-mixing machine consisting in combination with amixing-receptacle having circular outer and conical inner walls, of avertical shaft passing through the center of said receptacle, a pair ofcurved mixinglilades facing said outer and inner walls, adapted to turnthe contents of said receptacle back and forth at each revolution andcarried by said shaft, means for rotating said blades by said shaft, asystem of outlets in the base of said receptacle, through which theconcrete may be emptied, and a system of levers and doors, bywhich saidoutlets may be opened and closed.

3. A machine of the class set forth consisting in combination, of amixing-receptacle having outer and inner walls, a vertical shaft passingthrough the center of said receptacle, a pair of mixing-blades carriedby said shaft and adapted to turn the contents of the receptacle backand forth at each revolution, means for rotating said blades by saidshaft, a plurality of outlets in the base of the receptacle, a system ofdoors in said outlets and hand-levers for opening and closing saiddoors, measuring-buckets pivoted on said receptacle for the cement,sand, &c., to be used for the concrete, and a system of catches forholding said buckets in normal position, said buckets adapted, whenreleased from said catches, to tilt down so as to emptyinto saidreceptacle.

4. Aconcrete-mixing 1nachine,consistingin combination with amixing-receptacle, having circular outer and conical inner walls, of avertical shaft passing centrally through said receptacle, a pair ofcurved mixing-blades positioned in diametral alinement between saidwalls and carried by said shaft, means for revolving said blades betweensaid walls, and an outlet in the base of said receptacle, adapted toempty the same.

5. A concrete-mixing machine, consisting in combination with amixing-receptacle, having circular outer and conical inner walls, of avertical shaft, passing through the center of said receptacle, a pair ofcurved mixingblades facing said outer and inner walls Within saidreceptacle and carried by said shaft, means for rotating said blades bysaid shaft, an outlet in said receptacle through which the concrete maybe emptied, measuringbuckets journaled on said receptacle, for thecement, sand, &c., to be used for the concrete, and means for lockingsaid buckets in normal position.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

)ARL OTIS.

Witnesses:

F. G. BRADDURY, V. L. THAUW'ALD.

